gcc gives "array subscript is above array bounds [-Werror=array-bounds]" when using optimization option -03

Issue

• When I compile the a module using optimization level 2 it success, however when I do this same code with optimization level 3 it fails. The code content is in the file test_code.c which I have uploaded to this ticket.

• The script to compile with -O2 option is:

/usr/bin/gcc -c -m32 -ansi -D_GNU_SOURCE \
        -funsigned-char -fno-zero-initialized-in-bss -fno-strict-aliasing \
        -DLANGUAGE_C  -Wall -Wno-strict-aliasing -Wextra -Werror \
        -O2 \
        -pipe -Wstrict-prototypes -Wmissing-prototypes test_code.c

• Compile call with -O3 option:

/usr/bin/gcc -c -m32 -ansi -D_GNU_SOURCE \
        -funsigned-char -fno-zero-initialized-in-bss -fno-strict-aliasing \
        -DLANGUAGE_C  -Wall -Wno-strict-aliasing -Wextra -Werror \
        -O3 \
        -pipe -Wstrict-prototypes -Wmissing-prototypes test_code.c

• The error from the compile with -O3 is attached to this ticket. I did not see any of these errors with the -O2 compile.